Redart

I'm starting to get away from bought glazes and mixing my own instead, mostly from previously published recipes but I like to give them a tweak here and there,. (firing to ^6 Ox)

I often see Redart listed as a glaze ingredient and am wondering if any red earthenware clay will provide a good substitute or is there something special about Redart which makes it particularly suitable as a glaze ingredient?

I have access to some Fremington clay and obviously any other clay available at suppliers here.

Earthenware clays aren't interchangeable but some may be close enough to sub for each other, especially if the earthenware clay is a low percentage of the glaze. You may get a glaze that works but it will not be the same glaze. You can compare the two clays you mentioned here:

the recipe i have for a red clay that fires at cone 6 is made up of only 2 ingredients. half redart and half XX saggar. it is very hard to break. i have had pieces fall 6 feet to concrete and not break or chip. it rings nicely, too. why does it work????

the recipe i have for a red clay that fires at cone 6 is made up of only 2 ingredients. half redart and half XX saggar. it is very hard to break. i have had pieces fall 6 feet to concrete and not break or chip. it rings nicely, too. why does it work????

The weathering and sedimentary process that resulted in Redart deposits also created a unique inverted chain crystal in that clay's phyllosilicate minerals that just happens to fit perfectly into the montmorillonite-smectite polly strands of colloid crystals in the more sedimentary XX Saggar producing partial reverse liquefaction.

the recipe i have for a red clay that fires at cone 6 is made up of only 2 ingredients. half redart and half XX saggar. it is very hard to break. i have had pieces fall 6 feet to concrete and not break or chip. it rings nicely, too. why does it work????

The weathering and sedimentary process that resulted in Redart deposits also created a unique inverted chain crystal in that clay's phyllosilicate minerals that just happens to fit perfectly into the montmorillonite-smectite polly strands of colloid crystals in the more sedimentary XX Saggar producing partial reverse liquefaction.

Jim

Jim are you being funny or is that real clayspeak

Caution big brother is watching.
The beige is blinding!!!!!!
The middle of the road is boring

The true sign of intelligence is not knowledge but imagination.
-Albert Einstein

i just looked at all my own pots and found that there are 3 of them made in that clay. the only thing that shows the color is the bottom which had been waxed before glazing. i can take pictures but not post them here since i just don't seem to get them right. the color is the color of redart. plain red brown. make up 5 pounds and try it. it is very smooth but you could add grog since it is inert, (i think) and won't affect much more than tooth and color.

i stopped using it because my hands were constantly stained by it. it is a really good clay.

i used the cement mixer at Foxcross Pottery and just tossed in a bag of each, some water and turned it on. Del Martin had set up the cement mixer years ago and allowed me to use it. i took home 6 or 8 five gallon buckets of fresh clay each time.

You could try gold art or any other clay but it might not vitrify at cone 6 or it might over fire at cone 6 and become a glaze puddle.

Make up a sample test tile and fire it your next cone 6 firing and see what it looks like, then weight it and write this in a note pad or glaze book. Soak the test tile over night in water, take and towel dry it and weigh it again. Note the difference in weight if any, this is the of water absorption. If it's 1% or so that's vitrified the higher the water content the more pourous the clay.

the recipe i have for a red clay that fires at cone 6 is made up of only 2 ingredients. half redart and half XX saggar. it is very hard to break. i have had pieces fall 6 feet to concrete and not break or chip. it rings nicely, too. why does it work????

The weathering and sedimentary process that resulted in Redart deposits also created a unique inverted chain crystal in that clay's phyllosilicate minerals that just happens to fit perfectly into the montmorillonite-smectite polly strands of colloid crystals in the more sedimentary XX Saggar producing partial reverse liquefaction.

EPK is a high fire clay as is ball clay. Goldart can be used, the effects may not be the same as expected and may turn out uugly as a garbage pail kid but it will give a wealth of information whether good or bad on learning about glazing.